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PUBLIC-HEALTH SER� ICES <br /> P. <br /> .CD <br /> SAN JOAQUIN COUNTY =: Z <br /> ENVIRONMEN'T'AL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 9 ► <br /> (209) 468-3420 C(OF, <br /> FEB 2 4 1995 <br /> C SUSI JACKSON, DIVISION LEADER <br /> OPERATIONS AND REGULATORY AFFAIRS <br /> LAWRENCE LIVERMORE NATIONAL LABORATORY (LLNL) <br /> P O BOX 808-L-633 <br /> LIVERMORE CA 94550 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has recently completed <br /> an evaluation of the analytical data reported in the LLNL document entitled "Soil Sample Analyses Results from <br /> the Building 829 Diesel Fuel Tank Closure Site Excavation, Tank System 829-D1U1" dated February 2, 1995. <br /> This letter confirms the completion of the tank removal investigation for the underground storage tank 829- <br /> DIUI. With the provision that the information provided to this agency was accurate and representative of <br /> existing conditions, it is our position that no further action of the underground storage tank is required at this <br /> time. <br /> The following conditions continue to exist at the above site: <br /> Petroleum hydrocarbons quantitated as diesel fuel remain at the limits of the tank excavation attempt which was <br /> 17 feet below grade surface (bgs). Three discreet samples were collected December 21, 1994 (TK05-829-01- <br /> D 1 U 1-SO-17.0; TK06-829-01-D I U 1-SO-17.0; and TK07-829-01-D I U I-SO-17.0), and one sample was <br /> reanalyzed (TK04-829-01-DIUI-SO-17.0) for the purpose of performing hydrocarbon analyses on homogenized <br /> portions of the submitted samples. The results are respectively, 58 mg/kg TPH-D; 930 mg/kg TPI-I-D; 630 <br /> mg/kg TPH-D; and 990 mg/kg TPH-D. PIIS-EI-ID averaged the results and concludes that approximately 994 <br /> mg/kg TPH-D remain at 17 0 bgs. Groundwater is greater than 100 feet bgs and monitoring wells W829-06 and <br /> W829-08 exist within 120 ft cross gradient from the former tank location. <br /> Please be advised that this letter does not relieve you of any liability under the California Health and Safety <br /> Code or Water Code for past, present, or future operations at the site. Nor does it relieve you of the <br /> responsibility to clean up existing, additional or previously unidentified conditions at the site which cause or <br /> threaten to cause pollution or nuisance or otherwise pose a threat to water quality or public health. <br /> Additionally, be advised that changes in the present or proposed use of the site may require further site <br /> characterization and mitigation activity. It is the property owner's responsibility to notify this agency of any <br /> changes in report content, future contamination findings or site usage, <br /> If you have any questions, please contact me at (209) 468-3452. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Diane M. Hinson, RENS, Supervisor <br /> Site Mitigation Unit <br /> cc: R. Henry, L-633 S. Timm, CVRWQCB <br /> A Dkkinn of tiara joa(luin(buil} Ilealm ('arc Sercicc,. <br />